New Delhi, June 3 -- India on Tuesday said all undemarcated segments of the frontier with Nepal should be settled by existing bilateral mechanisms and ruled out any role for third parties, days after Nepal's Prime Minister Balendra Shah sought the involvement of China and the UK in resolving outstanding border disputes. Most of the 1,850-km border between the two countries has been demarcated, except for two sections at Kalapani and Susta. On Sunday, Shah said in Nepal's Parliament that China and Britain should have a role in resolving border disputes with India even as he contended that both sides had encroached on each other's territories. External affairs ministry spokesperson Randhir Jaiswal acknowledged Shah's remarks about the India-Nepal boundary at a regular media briefing and said: "While close to 98% of the India-Nepal boundary has been demarcated, there are some unresolved segments. The shifting of the course of the Gandak river has resulted in this situation." Jaiswal noted that there are also cases of "cross-border occupation and encroachment of No Man's Land in demarcated segments of the boundary" that are currently being jointly mapped by the two sides. "We have established bilateral mechanisms to deal with all aspects of boundary matters. It should be clear to all concerned that there is no role for any third parties in a bilateral matter between India and Nepal," he said. India and Nepal have been engaged in a long-running dispute over the areas of Limpiyadhura, Lipulekh and Kalapani....